C Specification

The VkRayTracingPipelineInterfaceCreateInfoKHR structure is defined as:

// Provided by VK_KHR_ray_tracing_pipeline
typedef struct VkRayTracingPipelineInterfaceCreateInfoKHR {
    VkStructureType    sType;
    const void*        pNext;
    uint32_t           maxPipelineRayPayloadSize;
    uint32_t           maxPipelineRayHitAttributeSize;
} VkRayTracingPipelineInterfaceCreateInfoKHR;

Members

  • sType is the type of this structure.

  • pNext is NULL or a pointer to a structure extending this structure.

  • maxPipelineRayPayloadSize is the maximum payload size in bytes used by any shader in the pipeline.

  • maxPipelineRayHitAttributeSize is the maximum attribute structure size in bytes used by any shader in the pipeline.

Description

maxPipelineRayPayloadSize is calculated as the maximum number of bytes used by any block declared in the RayPayloadKHR or IncomingRayPayloadKHR storage classes. maxPipelineRayHitAttributeSize is calculated as the maximum number of bytes used by any block declared in the HitAttributeKHR storage class. As variables in these storage classes do not have explicit offsets, the size should be calculated as if each variable has a scalar alignment equal to the largest scalar alignment of any of the block’s members.

Note

There is no explicit upper limit for maxPipelineRayPayloadSize, but in practice it should be kept as small as possible. Similar to invocation local memory, it must be allocated for each shader invocation and for devices which support many simultaneous invocations, this storage can rapidly be exhausted, resulting in failure.

Valid Usage
Valid Usage (Implicit)
  • VUID-VkRayTracingPipelineInterfaceCreateInfoKHR-sType-sType
    sType must be VK_STRUCTURE_TYPE_RAY_TRACING_PIPELINE_INTERFACE_CREATE_INFO_KHR

  • VUID-VkRayTracingPipelineInterfaceCreateInfoKHR-pNext-pNext
    pNext must be NULL

See Also

Document Notes

For more information, see the Vulkan Specification

This page is extracted from the Vulkan Specification. Fixes and changes should be made to the Specification, not directly.

Copyright 2014-2021 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0